<template>
  <SvgIcon
    :size="size"
    :name="getSvgIcon"
    v-if="isSvgIcon"
    :class="[$attrs.class, 'anticon']"
    :spin="spin"
  />
  <span
    v-else
    ref="elRef"
    :class="[$attrs.class, 'app-iconify anticon', spin && 'app-iconify-spin']"
    :style="getWrapStyle"
  ></span>
</template>
<script lang="ts">
import {
  PropType,
  defineComponent,
  ref,
  watch,
  onMounted,
  nextTick,
  unref,
  computed,
  CSSProperties
} from "vue";
import SvgIcon from "./SvgIcon.vue";
import Iconify from "@purge-icons/generated";
import { isString } from "/@/utils/Is";
import { propTypes } from "/@/utils/PropTypes";

const SVG_END_WITH_FLAG = "|svg";
export default defineComponent({
  name: "Icon",
  components: { SvgIcon },
  props: {
    // icon name
    icon: propTypes.string,
    // icon color
    color: propTypes.string,
    // icon size
    size: {
      type: [String, Number] as PropType<string | number>,
      default: 16
    },
    spin: propTypes.bool.def(false),
    prefix: propTypes.string.def("")
  },
  setup(props) {
    const elRef = ref<ElRef>(null);

    const isSvgIcon = computed(() => props.icon?.endsWith(SVG_END_WITH_FLAG));
    const getSvgIcon = computed(() => props.icon.replace(SVG_END_WITH_FLAG, ""));
    const getIconRef = computed(() => `${props.prefix ? props.prefix + ":" : ""}${props.icon}`);

    const update = async () => {
      if (unref(isSvgIcon)) return;

      const el = unref(elRef);
      if (!el) return;

      await nextTick();
      const icon = unref(getIconRef);
      if (!icon) return;

      const svg = Iconify.renderSVG(icon, {});
      if (svg) {
        el.textContent = "";
        el.appendChild(svg);
      } else {
        const span = document.createElement("span");
        span.className = "iconify";
        span.dataset.icon = icon;
        el.textContent = "";
        el.appendChild(span);
      }
    };

    const getWrapStyle = computed((): CSSProperties => {
      const { size, color } = props;
      let fs = size;
      if (isString(size)) {
        fs = parseInt(size, 10);
      }

      return {
        fontSize: `${fs}px`,
        color: color,
        display: "inline-flex"
      };
    });

    watch(() => props.icon, update, { flush: "post" });

    onMounted(update);

    return { elRef, getWrapStyle, isSvgIcon, getSvgIcon };
  }
});
</script>
<style lang="less">
.app-iconify {
  display: inline-block;
  // vertical-align: middle;

  &-spin {
    svg {
      animation: loadingCircle 1s infinite linear;
    }
  }
}

span.iconify {
  display: block;
  min-width: 1em;
  min-height: 1em;
  background-color: @iconify-bg-color;
  border-radius: 100%;
}
</style>
